\begin{tabular}{|c|c|}
Distance (ft) & number of pixel & length on screen \\
1000 & 193.8  & approx 2 in \\
5000 & 39.0  &  approx 1/3 in \\
5280 (1 mi) & 37.0 & apporx 1/3 in\\
10000 & 19.5 & less than a 1/4 in \\
20000 & 9.8 & approx 1/10 in \\
40000 & 4.8 & aprrox 1/20 in (a big dust on screen) \\
80000 & 2.4 & aprrox 1/40 in (a medium dust on screen) \\
\end{tabular}
